Got this radio the other day. Turned it on and surprisingly no filter hum. I can get Stations on AM but can’t hardly hear them but when I touch the AM antenna, the radio gets extremely loud, anyone know why this is? Also I have no FM at all, I changed a 8 uf Nashville brand cap, nothing. Subbed all tubes with known good ones and nothing. Checked resistors and all are within tolerance. What could be the issue?